Coil-shield for dynamo-electric machines.



J. E ,vvEBsTBR 5 P. nur?. GQIL SHIELD POR DYNAMO ELECTRIC MACHINES.

APPLIoATmxr-LBD APR. za, 1906.

Patented-May 3,1910.

1 REBETB-SHEET l.

INVEN'TORS wiNEssEs:

ATTORNEY.

J. E; WEBSTER & P. DUPP. COIL SHIELD IOR DYNAMO ELECTRIC MACHINES.

APLICATION FILED APR- ZB, 1906.

Patented May y3, 1910.

B SHEETS-SHEET 2.

, n. lINVENTORS- g c?,

, ATTRNEY WlTNESSES:

UNITED STATES PATENT OFFICE.

JOHN E. WEBSTER, OF PITTSBURG, AND FRANK DUFR. OF ALLEGHENY, PENNSYL- VANIA, ASSIGNORS T0 WESTINGHOUSE ELECTRIC 6c MANUFACTURING COMPANY,

A CORPORATION 0F PENNSYLVANIA.

Y COIL-SHIELD FOR DYNAMIC-ELECTRIC MACHINES.

Specification of Letters Patent.

Patented May 3, 1910.

To all whom 'it may concern:

Be it known that we, JOHN E. WEBSTER andFnANK DUFF, citizens of the United States, and residents, respectively, of Pittsburg and of. Allegheny, in the county of Allegheny and State o Pennsylvania, have invented certain new and useful Improvements in Coil-Shields for Dynamo-Electric Machines, of which the following is a specification.

*Oui* invention relates to shields or protective means for the coils of dynamo-electric machines and it has for it-s to'pr'ovide a shield of the aforesaid class that shall be simple and durable in construction and that shall be s ecially adapted to protect eld magnet coi s of railway motors or similar machines and the conducting leads attached thereto. l

Shields or guards have Vusually lbeen placed over the field magnet coils of railway motors inorder to protect them from mechanical injury and have been held in position by suitable fianges on the pole tips. The pole tips are generally laminated and are bolted `onto inwardly projecting pole pieces Aafter the field magnet coils and their shields are placed in position, the fianges on l .the pole tips serving the double purpose of distributing the flux and supporting the field coils. A portion of each coil shield was cut away at each side to avoid screw terminals which were attached to the opposite extremi-` -ties of P the coils and lwhich were adapted to receive connecting cables or other suitable leads. There has been a'tendency, by reason of the vibration to which railway motors are-subjected, for the conductors of which the leads were comprised, to break at the points where the leads left the screw terminals.

In order to avoid this tendency, and to suitably protect the field magnet coil, we

provide a coriugation' in the coil shield' which is adapted to fitover the portieri of the lead which is adjacentto the screw terminal. p

In the accompanying drawings, Figure 1 is a plan view, Fig. 2 a side elevation and Fig. 3 an end elevation, partiallyT in crosssection, of a field magnet coil for a dynamoelectric machine which is provided with the shield of our invention. v

Referring to the drawings, a coil l for a field magnet 'frame 2 of' a dynamo-electric machine, having screw terminals 3, is provided wit'h a shield or guard 4. The shield 4 comprises a thin plate of suitable material, such as sheet steel, having inwardly projecting flanges 4 which are formed by cutting substantially diagonal lines through its center and bending down the four sides at right angles to the plate. These projections are adapted to fit into the opening in tlie field magnet coil and serve to hold the shield in position. A portion of the: shield is cut away atieach side to avoid the screw* terminals 3 and opposite `corners 5 and 6 of the shield are bent into the form of a sleeve segment or corrugation to protect the conductor leads l and 8 which are attached to the screw terminals.

- Our invention is not restricted to the type of coil or form of shield shown'and we desire that it shall be construed to cover variations in size and arrangement which effect similar results.

le claim as our invention:

l. A shield for a dynamo-electric machine coil and its leads, said shield having diagonally opposite edge portions bentpartially around t-he coil leads to protect them from injury.

2. A projecting shield for a field magnet coil and -leads of a dynamo-electric machine,- said shield having edge portions bent partially around the coil leads.

3. A shield for a field magnet coil of a. dynamo-electric machine comprising a plate adaptedto fit over the coil and cut away at its sides to avoid the coil terminals and having means for protecting and supporting the conductor leads adjacent to said terminals.

' 4. A shield or guard for a field magnet Vcoil of a dynamo-electric machine comprising a plate cut away at. opposite sides to l avoid thefcoil terminals and having projections adapted to engage the inner surfaces of the coil, and a curved edge portion adjacent to each terminal. to receive the corresponding conductor lead.

n5. A .shield or guard for a field magnetcoil of 'a dynamo-electric machine comprissubscribed our names this 21st clay of April, ing a plate xut away1 at olpposite sides to 1906. avoid thecoi terminas an( havin v rojec- T 1 tions adapted to engage the innergsllirfaces IIE'DVYJITER of the coil, and edge portions adapted to partially surround the conductor leads to Witnesses: protect them from Vibratory strains. HENRY W. DRIEVER,

In testimony whereof, We have hereunto BIRNEY HINES. 

